Mechanical stoker.



J. E. MURPHY.

MECHANICAL STOKER. APPLICATION FILED MAR. 10. 19m.

1 ,140,761 Patented May 25, 1915.

1 1:15 NORRIS PETERS ca. PHofo-ilruo; WASHINGTON. n. c.

JOHN EDWARD MURPHY, OF WINNIPEG, MANITOBA, CANADA.

MECHANICAL STOKER.

Specification of Letters Patent.

Patented May 25, 1915.-

Application filed March 10, 1914. Serial No. 823,731.

To all whom it may concern Be it known that 1, JOHN EDWARD MUR- PHY, a subject of the Kingof Great Britain,

and resident of 375 Notre Dame street, in

the city of Winnipeg, Province of Manitoba, in the Dominion of Canada, have invented certain new and useful Improvements in Mechanical Stokers; and I do'hereby. declare that the following is a full, clear, and exact description of the same.

I The invention relates to improvements in mechanical stokers as described in the present specification and illustrated in the ac companying drawings that'form part of the same.'

The invention consists essentially in the novel construction and arrangement of parts whereby the quantity of coal in the hopper leading to the-feed opening of a furnace can readily be reduced to the minimum by the means employed for cutting off the main body of coal, and retaining same in hopper 7 without danger of it burning.

The objects of the invention are to change the conditions existing quickly from a working fire to a banked fire and thus effect a great saving in fuel, to avoidunnecessary combustion of fuel in fire box and the cooling off of the boiler due to air entering 30 through hopper and feed opening, to minimize the troubles incident of the burning back into the hopper from the firebox as is sometimes the case during feeding to a slow fire, and generally to provide a simple, eflicient and durable stoker.

In the drawings, Figure 1 is a sectional perspective view showing the arrangement of the plates in the hopper mechanism. Fig. 2 is a cross sectional view of the stoker.

Like numerals of reference indicate corresponding parts in each figure.

1 are the side walls of the hopper extending to the furnace wall 2 and rigid therewith.

3 is a plate rigidly secured to the side walls 1 a short distance outwardly from the furnace wall 2 and terminating above the feed opening 5, said plate forming the inner wall of the hopper and spacing said hopper from the furnace wall 2. This construction forms an air passage 6 behind the hopper through to the feed opening 5 besides providing a space which may also be used to introduce a poker to relieve any congestion on the hopper chute.

7 are brackets secured to the walls 1 and extending in a slanting direction downwardly to a point in alinement with the upper end of the feed opening 5.

'8 is a cut off plate supported on the brackets 7 and extending upwardly beyond the walls 1 at the top end thereof and slidably arranged and supporting a great body of coal in the hopper under certain conditions.

9 are toothed racks rigidly secured to the under side of the cut off plate 8 at each end thereof.

10 is a shaft ournaled in the side walls 1 toward the upper end thereof in that portion of said side walls most distant from the furnace, said shaft extending outwardly beyond one of said side walls 1 and having mounted thereon any suitable arrangement for operating, though the handle 11 is shown in the drawing, which operates the ratchet 12. This is common practice and is only merely mentioned herein.

13 are pinions rigidly mounted on the shaft 10 adjacent to the ends thereof and coacting with the racks 9. Of course in the drawings only one pinion and one rack is shown, though the same construction is at the other end but is not illustrated.

It will be thus seen that by operating the handle 11 the cut off plate 8 may be raised and lowered as desired, and in raising said plate the upper part of said hopper will be put in communication with the lower part, while in lowering the plate the said plate is made the bottom of an upper compartment in the hopper for supporting the main quantity of coal. When the fire is banked this plate is lowered right to the furnace wall 2 stopping air from coming through passage 6 to the furnace and boiler thereby stopping unnecessary combustion of coal and cooling of boiler.

11 is a dead plate extending inwardly into the firebox from the sill 15, said sill 15 being at the lower end of the inclinedquantity ofcoal or feeding it iniby very small quantities, the fire is banked only by the .coal which is .left between the cut off plate and the bottom of the hopper. This quantity is just suflicient for the purposes of a slow fire and consequently no; more fuel is used than is actually required. -Not only that but the condition of matters in the furnace is-such as'to providea temperature which will keep the boiler.- ata uniform degree without expenditure, of quantities of fuel and therefore make" the raising of the temperature .of' the water for steaming conditions much cheaper and simpler than under ordinary circumstances.

hat I'claim is: p.

, 1. In a mechanical stoker, a furnace wall having a feed opening therethrough,za,hopper having side walls extending outwardly from ,said furnace wall, an inner wall secured to said side walls a short dist'ance from said furnace wall and terminating above said feed opening and achute bottom formed of a rigid plate and a pivoted plate, a cut off plate extending across said hopperand beneath said inner wall'to said furnace wall above the feed'vopeningandslidably supported, and means for operating said out off plate. I :j, o l

2. In a mechanical stoker, an inner wall rigidly secured and terminating at its lower end above the feed opening to the firebox,

c jii o f this pateht be ohta iiie d foi' pivotally supportedfrom said shaft andextending downwardly therefrom below said out off plate,'. and a. rigidinclinedplate extendingto ,said feed opening under said pivoted inclined plate. V

. 3. In a mechanical stoker, sanuinner wall rigidly secured to and spaced from the furnace wall above the feedopeningto the firebox, .sideywalls standing out beyond said inner:wall.'and rigid' therewith, a'shaft journaled in the, outer upper ends of said side walls, a plate slidablysupportedfrom said side walls and extending downwardly from above said shaft under the lower-end of said inner. wall,, means operatively; connecting said. plate and said shaft, a permanent inclined plate extending upwardly from the. lower endof said feed opening, a pusher suitably operated over said inclined, plate, an upper inclined plate having lugs extending therefrom pivotally supporting said plate from said shaft under the ,aforesaid' plate, said upper inclined plate at'itslower end resting on the upper side of said pusher, and means for operating said shaft. U I z V Signedat city of Winnipeg, Province of Manitoba, Dominion of Canada, this twentyninth day of January, 1914.-. a

1 z JOHN EDWARD Witnesses: 1 V. J, McDoNNnnL, G. J (HAMILTON.

fiye: peiits each,-

addressing the Commissioner ot lateiits,

washingto m D. O.

MURPHY. 

